EP1356936B1 - Apparatus and method for maintaining constant drop volumes in a continuous stream ink jet printer - Google Patents
Apparatus and method for maintaining constant drop volumes in a continuous stream ink jet printer Download PDFInfo
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- EP1356936B1 EP1356936B1 EP03076078A EP03076078A EP1356936B1 EP 1356936 B1 EP1356936 B1 EP 1356936B1 EP 03076078 A EP03076078 A EP 03076078A EP 03076078 A EP03076078 A EP 03076078A EP 1356936 B1 EP1356936 B1 EP 1356936B1
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- European Patent Office
- Prior art keywords
- ink
- sensing device
- drop
- forming mechanism
- printhead
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/09—Deflection means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2002/022—Control methods or devices for continuous ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
- B41J2002/031—Gas flow deflection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
- B41J2002/033—Continuous stream with droplets of different sizes
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Description
- The present invention relates generally to ink jet printers, and more particularly to compensating for inconsistencies in ejected drop volumes.
- Continuous ink jet (also commonly referred to as continuous stream, etc.) printing systems, use a pressurized ink source and a drop forming mechanism for producing a continuous stream of ink drops. Conventional continuous ink jet printers utilize electrostatic charging devices that are placed close to the point where a filament of working fluid breaks into individual ink drops. The ink drops are electrically charged and then directed to an appropriate location by deflection electrodes having a large potential difference. For example, when no printing is desired, the ink drops (non-printed drops, etc) are deflected into an ink capturing mechanism (catcher, interceptor, gutter, etc.) and either recycled or discarded while non-deflected ink drops (printed drops, etc.) are permitted to contact a recording media. Alternatively, printed ink drops can be deflected toward the recording media while non-deflected non-printed ink drops travel toward the ink capturing mechanism.
- As drops are continuously being formed and selectively deflected during operation, print quality and system performance in continuous ink jet printers is particularly sensitive to variations in drop volume (drop size, etc.). Variations in drop volume can cause the printed dot size on the recording media to vary which can adversely affect print quality. For example, when the volume of ejected drops increases or decreases while a page of recording media is being printed, the colors printed at the top of the page can be inconsistent with the colors printed at the bottom of the page. This can affect the darkness of black-and-white text, the contrast of gray-scale images, and the saturation, hue, and lightness of color images. Additionally, variations in drop volume can adversely affect system performance. For example, the drop deflection mechanism may not consistently deflect drops when the drop volume varies. This can result in an increase or a decrease in the deflection angle causing drops to be deflected too much or not enough.
- A change in ink viscosity caused by, for example, a change in operating temperature can cause drop volumes to vary. While changes in ink viscosity caused by the evaporation of the solvent component of the ink composition can be compensated for measuring either the optical absorbency or the electrical conductivity of the ink and adding make-up solvent accordingly, ink viscosity is also a function of temperature. For example, a drop forming mechanism that provides drops having a desired volume at normal ambient room temperature (e.g., 60°-82°F) can provide drops having a larger undesired volume when the surrounding temperature increases (e.g., 85°-95°F). The extra ink provided by the drop forming mechanism degrades the print quality by causing an increase in the density of the printed dot. Alternatively, the drop forming mechanism can provide drops having a smaller undesired volume when the surrounding temperature decreases which can also degrade print quality.
- Even when the printer is located in a room that is successfully maintained within a normal ambient temperature range, the temperature of the printhead housing the drop forming mechanism can increase beyond acceptable ambient temperatures due to, for example, the heat generated by forming and/or deflecting the drops. Again, this produces a variation in drop volume which can adversely affect print quality. In these situations, adding solvent or ink concentrate to the ink composition to compensate for the temperature induced viscosity changes produces an ink composition having unintended property changes, for example changes in optical density and, as such, is an inadequate solution to the problem.
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U.S. Patent No. 5,623,292 issued to Shrivastava et al. on April 22, 1997 , provides a temperatures control unit in a printhead in order to control ink temperature. The temperature control unit includes a heat pump assembly coupled to a heat exchanger through which the ink flows. However, this solution is disadvantaged in that it requires additional hardware for the heating and/or cooling the ink which increases the cost of the printer. Additional time is also required prior to printing in order to permit the ink to reach a desired temperature. -
U.S. Patent No. 5,646,663 discloses an apparatus and method for producing a stream of ink drops in a continuous ink jet printer having a maximum allowable number of fast satellite drops. An ink, which may be a hot-melt ink in its liquid phase, is pressurized for continuous flow to a nozzle and a rectangular or triangular waveform is generated at a fixed frequency. The waveform is applied to a transducer coupled to the nozzle such that nozzle vibrates and the ink flow is perturbed and discharged from the nozzle as primary drops with satellite drops formed therewith. The harmonic content of the rectangular or triangular waveform is adjusted until the desired number of fast satellite drops suitable for desired image formation are formed in the stream of primary drops. In a preferred embodiment, the desired number of fast satellites is a maximum of three. - It is an object of the present invention to provide a method of maintaining an ejected ink drop volume. Another object of the present invention is to provide an apparatus for ejecting ink. These objects are achieved by the invention as defined in the appended claims.
- Other features and advantages of the present invention will become apparent from the following description of the preferred embodiments of the invention, and the accompanying drawings, wherein:
- FIG. 1 is a schematic diagram of a printing apparatus incorporating the present invention;
- FIG. 2 is a schematic diagram of a printing apparatus incorporating the present invention;
- FIG. 3 is a top view of a printhead having a drop forming mechanism incorporating the present invention;
- FIG. 4 is a top view of a drop forming mechanism and a drop deflector system incorporating the present invention;
- FIG. 5 is a schematic side view of printhead having a drop forming mechanism and a drop deflector system incorporating the present invention;
- FIGS 6A and 6B are top views of a printhead incorporating the present invention;
- FIGS 6C and 6D are side views of a printhead incorporating the present invention;
- FIG. 7 is a graph of ink ejection velocity versus temperature;
- FIG. 8 is a block diagram of a controller incorporating the present invention;
- FIG. 9A are examples of drops formed by the waveforms shown in FIGS. 9B and 9C;
- FIGS 9B and 9C are drop forming mechanism activation wave forms used to produce the drops shown in FIG. 9A; and
- FIGS 10A-10C are schematic side views of a printhead incorporating alternative embodiments of the present invention.
- The present invention will be directed in particular to elements forming part of, or cooperating more directly with, apparatus in accordance with the present invention. It is to be understood that elements not specifically shown or described may take various forms well known to those skilled in the art.
- Referring to FIGS. 1 and 2, a continuous ink
jet printer system 100 incorporating the present invention is shown. Thesystem 100 includes animage source 10 such as a scanner or computer which provides raster image data, outline image data in the form of a page description language, or other forms of digital image data. This image data is converted to half-toned bitmap image data by animage processing unit 12, which also stores the image data in memory. Aheater control circuit 14 reads data from the image memory and applies electrical pulses to aheater 32 that is part of aprinthead 16A or aprinthead 16B. These pulses are applied at an appropriate time, so that drops formed from a continuous ink jet stream will print spots on arecording medium 18 in the appropriate position designated by the data in the image memory. Theprinthead 16A, shown in FIG. 1, is commonly referred to as a page width printhead, while theprinthead 16B, shown in FIG. 2, is commonly referred to as a scanning printhead. -
Recording medium 18 is moved relative toprinthead medium transport system 20 which is electronically controlled by a recording mediumtransport control system 22, and which in turn is controlled by a micro-controller 24. The recording medium transport system shown in FIG. 1 is a schematic only, and many different mechanical configurations are possible. For example, a transfer roller could be used as recordingmedium transport system 20 to facilitate transfer of the ink drops to recordingmedium 18. Such transfer roller technology is well known in the art. In the case ofpage width printheads 16A, it is most convenient to move recordingmedium 18 past astationary printhead 16B. However, in the case of scanning print systems, it is usually most convenient to move theprinthead 16B along one axis (the sub-scanning direction) and the recording medium along an orthogonal axis (the main scanning direction) in a relative raster motion. - Ink is contained in an
ink reservoir 28 under pressure. In the nonprinting state, continuous ink jet drop streams are unable to reach recordingmedium 18 due to anink gutter 34 that blocks the stream and which may allow a portion of the ink to be recycled by anink recycling unit 36. The ink recycling unit reconditions the ink and feeds it back toreservoir 28. Such ink recycling units are well known in the art. The ink pressure suitable for optimal operation will depend on a number of factors, including geometry and thermal properties of the nozzle bores (shown in FIG. 3) and thermal properties of the ink. A constant ink pressure can be achieved by applying pressure toink reservoir 28 under the control ofink pressure regulator 26. -
System 100 can incorporateadditional ink reservoirs 28 in order to accommodate color printing. When operated in this fashion, ink collected bygutter 34 is typically collected and disposed. The ink is distributed to the back surface ofprinthead ink channel 30. The ink preferably flows through slots and/or holes etched through a silicon substrate ofprinthead printhead heater control circuits 14 with the printhead.Printhead Printhead - Referring to FIG. 3,
printhead Printhead drop forming mechanism 38. Drop formingmechanism 38 can include a plurality ofheaters 40 positioned onprinthead printhead heater 40 may be disposed radially away from an edge of a corresponding nozzle bore 42, heaters 4 are preferably disposed close to corresponding nozzle bores 42 in a concentric manner. Typically,heaters 40 are formed in a substantially circular or ring shape. However,heaters 40 can be formed in other shapes. Typically, eachheater 40 comprises aresistive heating element 44 electrically connected to acontact pad 46 via aconductor 48. Contactpads 46 andconductors 48 form a portion of theheater control circuits 14 which are connected tocontroller 24. Alternatively, other types of heaters can be used with similar results. -
Heaters 40 are selectively actuated to from drops, for example as described in commonly assignedUS Patent No. 6,079,821 , entitled CONTINUOUS INK JET PRINTER WITH ASYMMETRIC HEATING DROP DEFLECTION. Additionally,heaters 40 can be selectively actuated to deflect drops, for example as described in commonly assignedUS Patent No. 6,079,821 . Whenheaters 40 are used to form and deflect drops,heaters 40 can be asymmetrical relative to nozzle bores 42, as shown in FIG. 4 and described in commonly assignedUS Patent No. 6,079,821 . - Referring to FIG. 4,
heater 40 has two sections covering one half of a perimeter of the nozzle bore 42. Each section ofheater 40 comprises aresistive heating element 44 electrically connected to acontact pad 46 via aconductor 48. Alternatively, drop deflection can be accomplished in any known fashion (electrostatic deflection, etc.) - Drop deflection can also be accomplished by applying a gas flow to drops having a plurality of volumes as described in commonly assigned, currently pending
US patent application Nos. 09/751,232 09/750,946 ink 62 having a plurality ofvolumes gas flow 54 supplied from adrop deflector system 56 including agas flow source 58 is continuously applied todrops drops 50 remain travelling substantially along path X or deviate slightly from path X and begin travelling along path Z. With appropriate adjustment ofgas flow 54, and appropriate positioning ofgutter 34, drops 52 contact a print media while drops 50 are collected bygutter 34. Alternatively, drops 50 can contact the print media whiledrops 52 are collected bygutter 34. - Typically, an
end 60 of thedroplet deflector system 56 is positioned along path X. Gases, including air, nitrogen, etc., having different densities and viscosities can be incorporated into thedroplet deflector system 56. Additionally, the gas flow can either be a positive pressure and velocity force or a negative pressure and velocity force (negative gas flow, vacuum, etc.). - Referring to FIGS. 6A-6D,
printhead system 100 either just prior to the ink being ejected fromprinthead printhead Temperature sensing device 64 can include a temperature sensing diode, a resistor, etc. In a preferred embodiment,temperature sensing device 64 includes elements (e.g. a diode(s)) that are easily formed with standard silicon fabrication techniques, and may be placed in one or more locations, so that ink temperatures can be determined across theentire printhead heater 40 can be used for temperature sensing providedheater 40 has a non-zero temperature coefficient of resistance. Whenheater 40 is used to measure ink temperature, the current flow throughheater 40 is measured whenheater 40 is activated. - In FIG. 6A, at least one
temperature sensing device 64 is positioned onprinthead temperature sensing devices 64 are positioned at predetermined locations, for example, at opposite ends ofnozzle row 66. In FIG. 6B, atemperature sensing device 64 is positioned next to each nozzle bore 42 innozzle row 66. Alternatively,temperature sensing device 64 can be positioned withinnozzle bore 42 (shown in FIG. 6C), or within ink delivery channel 30 (shown in FIG. 6D). Again,temperature sensing devices 64 can be positioned proximate to each nozzle bore 42 innozzle row 66 or at predetermined locations, for example, at opposite ends ofnozzle row 66 whentemperature sensing device 64 is positioned withinprinthead nozzle row 66 extends into and out of the page. Eachtemperature sensing device 64 is connected tocontroller 24. Depending on the location of temperature sensing device 64 (e.g. in nozzle bore 42, inchannel 30proximate heater 40, etc.), the measured temperature reflects the actual ink temperature just prior to, just after, or substantially at ejection of the ink through nozzle bore 42. Alternatively,temperature sensing device 64 can be located anywhere along or in the ink flow path where the ink reaches substantial thermal equilibrium with thedrop forming mechanism 38. Additionally,temperature sensing device 64 can be positioned at any location where a temperature signal is produced which is predictive of the ink temperature at the nozzle bore 42 through known thermal relationships between the location oftemperature sensing device 64 andprinthead - As discussed above, ink viscosity and other ink parameters can vary depending on the temperature of the ink and the surrounding operating environment. As such, the velocity of ink ejected through nozzle bores 42 will vary and the size of the ink drop formed will vary even though the activation times of the drop forming mechanism 38 (e.g. heater 40) remain constant.
- Referring to FIG. 7 a graph showing a typical qualitative relationship between ink temperature and ink velocity (with other parameters, such as
heater 40 and nozzle bore 42 geometry remaining constant) is shown. It can be seen that as temperature T increases from T1 to T2, and the velocity V of ink ejected through nozzle bore 42 increases due to a change in ink parameters such as viscosity which generally decreases. In this case, the difference between T1 and T2 is small enough to result in a generally linear relationship. However, the relationship can be of any type and can be determined mathematically or empirically. - Referring to FIG. 8,
controller 24 includes a lookup table 68, aprocessor 70, andtiming electronics 72, schematically shown. Temperature sensing device(s) 64 are connected to input(s) ofcontroller 24 so thatcontroller 24 receives input signals from temperature sensing device(s) 64. Drop forming mechanism 38 (e.g. heater 40) is coupled to outputs ofcontroller 24 so that drop forming mechanism 38 (e.g. heater 40) receives output signal fromcontroller 24. Lookup table 68 is populated with control data representing a desired time between pulses of the output signals to drop forming mechanism 38 (e.g. heater 40). The control data can be determined mathematically or through experiment. For example,print head -
Processor 70 reads the signal fromtemperature sensing device 64 to determine the temperature of the ink. The temperature of the ink can be an average over a period of time or instantaneous.Processor 70 then locates the control data in lookup table 68 corresponding to the ink temperature and feeds the control data to an input of thetiming electronics 72. Timingelectronics 72 generates a pulsed control signal as the output signal to drop forming mechanism 38 (e.g. heater 40) in accordance with the control data. This process is repeated over time to vary the output signal to drop forming mechanism 38 (e.g. heater 40) as ink temperature changes. - Referring to FIGS 9B-9C, control signals to activate drop forming mechanism 38 (e.g. heater 40) versus time are shown. It can be seen that the time period between
activation pulses 74 provided to drop forming mechanism 38 (e.g. heater 40) can be varied to createlarger drops 76 or smaller drops 78 (shown in FIG. 9A) formed during time intervals Δt1, Δt2, and Δt3, respectively. Generally, the relation
where V is the drop volume, Δt is the time interval between pulses, and f is the ink flow rate, is found for many inks to hold over a range of a factor of 50 in Δt, for a specified distance from the printhead. For example, the duration of eachactivation pulse 74 can be 0.5 to 1 microsecond and the time period between pulses can be varied between 2 and 100 microseconds. As ink flow rate is temperature dependent, Δt can be adjusted to compensate for a temperature change in the ink, so that the ejected drop volume remains constant. As ink temperature increases, ink viscosity generally decreases and ink flow rate increases. Accordingly, the time period between activation pulses can be decreased, from Δt1, Δt2, and Δt3 to Δt'1, Δt'2, and Δt'3, respectively, as shown in FIG. 9C so that the volumes ofdroplets - This invention can be applied to any type of printhead having a
drop forming mechanism 38 in which the time period between activation signals to thedrop forming mechanism 38 can be varied or controlled. In the embodiment discussed above, drop formingmechanism 38 includes aheater 40 positioned proximate nozzle bore 42 used to break up a fluid stream into drops. Additionally, any type of drop deflector system, for example,heater 40,system 56, etc. can be used. - The relationship between ink viscosity and ink temperature can be of any type and can vary between inks of different types and colors. For example, the relationship may not be linear or the ink viscosity may increase with temperature and may be different for each nozzle. Accordingly, each nozzle bore 42 can have a corresponding
temperature sensing device 64 so that selected portions of inkdrop forming mechanism 38 can be controlled independently. Additionally, the relationship between ink temperature and ink viscosity can be stored or represented incontroller 24 in any manner. For example, a mathematical algorithm, etc. can replace look up table 68. Ink temperature can also be monitored and appropriate timing changes made during printer operation which helps to maximize printer throughput. - Referring to FIG. 10A, an alternative preferred embodiment is schematically shown. In this embodiment, the ejected drop velocity is determined by a
velocity sensing device 80 using, for example, a time-of-flight velocity calculation method.Velocity sensing device 80 can include a co-linearlight source 82 and alight detector 84, for example, a laser diode, and a photodiode, respectively.Velocity sensing device 80 is positioned a known distance D fromprinthead drop 86 is ejected through nozzle bore 42 and passes throughvelocity sensing device 80. Other drops 88 are collected bygutter 34. After passing throughvelocity sensing device 80, drop 86 is collected in acontainer 90. The flow rate of thedrop 86 is then calculated bycontroller 24. The timing betweenactivation pulses 74 can be adjusted bycontroller 24 in direct proportion to the calculated ink flowrate using controller 24, so that a constant drop volume as a function of temperature, or another ink parameter is achieved. Typically,printhead Controller 24 can be of the type described with reference to FIG. 8, or can be of any known type suitable for varying the time period betweenactivation pulses 74. - By appropriately positioning
printhead velocity sensing device 80 and selectively actuating each drop forming mechanism 38 (e.g. heater 40), individual drop velocities associated with individual nozzle bores 42 can be determined. As such, the timing betweenactivation pulses 74 can be adjusted independently on a nozzle by nozzle basis in order to achieve constant drop volumes. This particularly advantageous when using a page-width printhead 16A because temperatures acrossprinthead 16A can vary substantially depending on frequency of heater activation, etc. Alternatively, a time-of-flight velocity calculation can be made for a smaller number of nozzle bores 42 with the activation timing adjustments for the entire printhead being determined by interpolation of the data, image data history, the amount of power dissipated at each nozzle, etc. - Referring to FIG. 10B, when the printhead, for
example printhead 16B, remains at an essentially uniform temperature and does not experience localized areas of temperature increases or decreases, the time period between activation pulses of drop forming mechanism 38 (e.g. heater 40) can be adjusted bycontroller 24 to correct for temperature changes based on a measurement of ink flow rate through theprinthead 16B. This ink flow rate can be determined by positioning amass flow sensor 92A or 92B anywhere in the ink supply path to theprinthead 16B. For example,mass flow sensor 92A can be positioned inink channel 30. Alternatively, mass flow sensor 92B can be positioned insupply path 94 betweenreservoir 28 andprinthead 16B. Advantages of measuring ink flow rate in this manner include being able to measure while the printer is operating which helps to maximize printer throughput.Controller 24 can be of the type described with reference to FIG. 8, or can be of any known type suitable for varying the time period betweenactivation pulses 74. - Referring to FIG. 10C, this invention can also be applied to compensate for changes in an ink parameter (for example, viscosity) that are not related to a change in ink temperature provided the time period between activation control signals provided to a drop forming mechanism can be varied. For example, individual formulations or batches of ink can have different viscosities. As such, ink viscosity can be determined by positioning a
viscosity sensor printhead viscosity sensor 96A can be positioned inink channel 30. Alternatively, viscosity sensor 96B can be positioned insupply path 94 betweenreservoir 28 andprinthead 16B, orviscosity sensor 96C can be positioned inreservoir 28. -
Controller 24 can adjust the time period between activation control signals supplied to drop forming mechanism 38 (for example, heater 40) based on the signal received fromviscosity sensor Controller 24 can be of the type described with reference to FIG. 8, or can be of any known type suitable for varying the time period betweenactivation pulses 74. Alternatively, the embodiment described with reference to FIG. 10A can be used to determine changes in an ink parameter (for example, viscosity) that are not related to a change in ink temperature. - The invention has been described in detail with particular reference to certain preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the scope of the invention.u03
Claims (10)
- A method of maintaining an ejected ink drop volume in a continuous inkjet printer comprising:determining a change in an ink parameter using an ink parameter sensing device positioned proximate to an ink flow path; andforming an ink drop using an ink drop forming mechanism including a heater by varying a time period between activation control signals provided to the ink drop forming mechanism in response to the change in the ink parameter.
- The method according to Claim 1, wherein determining the change in the ink parameter includes monitoring a temperature of the ink.
- The method according to Claim 1, wherein determining the change in the ink parameter includes monitoring a flow rate of the ink.
- The method according to Claim 1, wherein determining the change in the ink parameter includes monitoring a velocity of the ink.
- The method according to Claim 1, wherein determining the change in the ink parameter includes monitoring a viscosity of the ink.
- An apparatus for continuously ejecting ink comprising:a printhead (16A or 16B), portions of which define a delivery channel (30) and a nozzle bore (42), the delivery channel and nozzle bore defining an ink flow path;a drop forming mechanism (38) positioned proximate to the ink flow path that forms drops from ink moving along the ink flow path;an ink parameter sensing device (64, 80 , 92A, 92B, 96A, 96B, or 96C) positioned proximate to the ink flow path; anda controller (24) in electrical communication with the drop forming mechanism and the ink parameter sensing device configured to vary a time period between activation control signals provided to the drop forming mechanism in response to a change in an output signal received from the ink parameter sensing device, characterized by the drop forming mechanism including a heater.
- The apparatus according to Claim 6, wherein the ink parameter sensing device includes a temperature sensing device (64).
- The apparatus according to Claim 6, wherein the ink parameter sensing device includes a velocity sensing device (80) positioned a predetermined distance from the printhead.
- The apparatus according to Claim 6, wherein the ink parameter sensing device includes a mass flow sensing device (92A or 92B).
- The apparatus according to Claim 6, wherein the ink parameter sensing device includes a viscosity sensing device (96A, 96B, or 96C).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/131,533 US6883904B2 (en) | 2002-04-24 | 2002-04-24 | Apparatus and method for maintaining constant drop volumes in a continuous stream ink jet printer |
US131533 | 2002-04-24 |
Publications (2)
Publication Number | Publication Date |
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EP1356936A1 EP1356936A1 (en) | 2003-10-29 |
EP1356936B1 true EP1356936B1 (en) | 2007-08-15 |
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EP03076078A Expired - Fee Related EP1356936B1 (en) | 2002-04-24 | 2003-04-14 | Apparatus and method for maintaining constant drop volumes in a continuous stream ink jet printer |
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US (1) | US6883904B2 (en) |
EP (1) | EP1356936B1 (en) |
JP (1) | JP2003311971A (en) |
DE (1) | DE60315539D1 (en) |
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US7364277B2 (en) * | 2004-04-14 | 2008-04-29 | Eastman Kodak Company | Apparatus and method of controlling droplet trajectory |
US8689689B2 (en) * | 2004-11-12 | 2014-04-08 | Spraying Systems Co. | System and method for marking sheet materials |
US7673976B2 (en) * | 2005-09-16 | 2010-03-09 | Eastman Kodak Company | Continuous ink jet apparatus and method using a plurality of break-off times |
US7559629B2 (en) * | 2005-09-29 | 2009-07-14 | Lexmark International, Inc. | Methods and apparatuses for implementing multi-via heater chips |
US7594708B2 (en) * | 2005-12-30 | 2009-09-29 | Lexmark International, Inc. | Methods and apparatuses for sensing temperature of multi-via heater chips |
US7484823B2 (en) * | 2005-12-30 | 2009-02-03 | Lexmark International, Inc. | Methods and apparatuses for regulating the temperature of multi-via heater chips |
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DE60315539D1 (en) | 2007-09-27 |
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